Thomas cochean



(No Model.)

T. OOOHRAN. Telegraphic Sounders.

No. 228,608. Patented June 8,1880.

WWvweawa M lwvwg/C WM w 2 A, QMW} w wwv UNITED STATES PATENT OFFICE.

THOMAS OOOHRAN, OF BROOKLYN, NEW? YORK.

TELEGRAPHIC SOUNDER.

SPECIFICATION forming part of Letters Patent No. 228,608, dated June 8, 1880.

Application filed May 5, 1880.

To all whom it may concern:

Be it known that I, THOMAs OooHRAN, a citizen of the United States, residin at Brooklyn, in the county of Kings and State of New York, have invented new and useful Improvements in Electro-Magnetic Sounders, of which the following is a specification.

This invention consists in the combination, in an electromagnetic sounder, of an armature, a soft-iron core, the legs of which are fixed at their ends close to the armature, and free at their rear ends, and two coils which are movable on said legs in a direction toward and from the armature, for the purpose of regulating the attractive power of the electromagnet on the armature.

My invention is illustrated in the accompanyin g drawings, in which- Figure .1. represents a sectional side view. Fig. 2 is a sectional plan or top view.

Similar letters indicate corresponding parts.

In the accompanying drawings, the letters a a, designate the two legs of the soft-iron core, which are firmly secured in and connected together by a standard, I), that rises from the base A.

The front ends of the legs a c extend through the standard I), and are situated opposite to and in close proximity of the armature c, which is fastened to a lever, d, that has its fulcrum on a pivot, c, secured in a lug, f, which is fastened to the base A.

The free end of the armature-lever oscillates between. two set-screws, g h, and a spring, i, draws the armature back until the armaturelever strikes the point of the set-screw g.

On 'the legs a a of the core are fitted the coils in l, which are so constructed that they can readily slide on said legs, and in order to adjust them in the desired position different devices may be applied. In the example shown in the drawings the coils It I are connected by a traverse, m, to which is attached a ring or finger-piece, n, so that both coils can be moved toward or away from the armature. If desired, however, a lever or a screw, or any other suitable mechanism, may be substituted (No model.)

for the finger-piece n, and a suitable latch or locking device may be applied to retain the coils in the required position.

When the coils are drawn back away from. the armature the legs of the core become partially exposed and the power of the electromagnet is reduced, and vice versa, said power being at its maximum when the coils are pushed close up to the standard I), which supports and connects the legs a a.

It will be readily understood from this eX- planation that in my sounder no set-screw is required for adjusting the retraotive force of the spring i,- but the attractive force of the electro-magnet is regulated or adjusted simply by moving the'coils back away from or forward toward the armature, as circumstances may require.

In the drawings I have illustrated one form of a sounder; but it is obvious that my invention is applicable to sounders or equivalent devices of various description in which an electromagnet and an armature are used.

The object of my invention may also be accomplished by making the coils in sections, which can be put on the legs of the core or re moved therefrom successively; or the legs of the core maybe made in sections, one ormore of which can be removed if the power of the electro-magnet is to be reduced.

WVhat I claim as new, and desire to secure by Letters Patent, is

The combination, in an electro magnetic sounder or similar device, of an armature, a soft-iron core, the legs of which are connected and sustained at their ends close to the armature, and free at their rear ends, and two coils which are movable on said legs in a direction toward and from the armature, substantially as and for the purpose described.

In testimony whereof I have hereunto set my hand and seal in the presence of two sub scribing witnesses.

THOMAS OOOHRAN.

Witnesses:

W. HAUFF, E, F. KASTENHUZBER. 

